I can only guess the HD has SMART which in turn uses some on-bard logic. This in turn senses no track 0 or hell0f a error and won't allow further damage. This prevents a real trashing of data and it maybe too late to correct as you've removed bits&pieces. This is only a guess, unless you clipped some wiring too. The example you gave shown a HD drive but the actual mixer HD was a different one. I suspect it was much older like a 10 or 20gb HD. Maybe query them for further details may resolve your quest. But, I see the value if it all works. Of course you learn along the way.
I?m trying to convert an old hard drive into a magnetic stir plate basically using the directions found at http://tutorialtub.com/info/build-a-magnetic-stirrer-from-an-old-computer. I?ve got an old Seagate barracuda model# ST118273LW.
I plugged the power supply from another computer into it and it started up fine. Then I popped the top off and removed the arm and magnets leaving only the spindle motor & platters inside. When I plugged it back in and powered up nothing happens. What?s going on? Do I need to do something with the jumpers or something?